You should not try to reason with her or talk to her because that will just make her more mad or upset if you make her a present or apologize she will probably forgive you. Of you did not do anything wrong than give her some space. Also if it's a younger sister give her a present if it's an older sister use my other advice :)
madara doesnt have a sister only a brother named izuno or somthing like that.
do it behind her back
he doesnt have a sister -_-
no. she doesnt
she doesnt have a sister she has a younger brother Blaize Pearman
A lot of the times yes, but it doesnt really mean anything.
no she doesnt have a sister
she doesnt have a sister she has a younger brother Blaize Pearman
No she doesnt she has a step sister!
he doesnt have a sister, only an older brother paul
She doesnt even have a sister
I belive he doesnt have a sister?